Hydrogenerators

For more than 120 years, ANDRITZ HYDRO has been supplying generators for hydropower stations.

Today, generators with a total capacity of more than 160,000 MVA are in service all over the world.

hydropower plant

Hydrogenerators convert the mechanical energy from the turbine into electrical energy using an excitation system.

ANDRITZ HYDRO generators are characterized by their compact design, high efficiencies, and long lifetime thanks to the use of modern calculation methods and optimized manufacturing procedures and materials.

Depending on the hydropower plant characteristics, the turbine used and the required speed, the following generators are available:

Vertical shaft generators

Motor-generators

PIT type generators

Bulb generators

Special machines

Hydropower plant

Vertical shaft generators

Vertical shaft generators are coupled to vertical shaft hydro turbines of any size with outputs up to 840 MVA. ANDRITZ HYDRO has leading experience with vertical generators for Francis, Kaplan and Pelton turbines, for the whole range of outputs and speeds. More than 1,800 large generators supplied by ANDRITZ HYDRO are installed or under construction worldwide in over 700 power plants with a total capacity exceeding 130 GW.

Motor generators

Motor-generators are used in pumped storage plants to generate electrical energy and to drive pump turbines. ANDRITZ HYDRO has supplied motor-generators for pumped storage applications up to 360 MVA with constant or variable speed and one or two directions of rotation, and also has experience with all unit configurations, for example fixed coupling to reversible pump turbines or to a turbine-plus-pump set. The unit can be started with static frequency converters (SFC), pony motor, back-to-back, or a turbine. ANDRITZ HYDRO has special experience in variable-speed motor-generators for optimum efficiency at variable heads and for maximum grid benefits.

hydropower plant rotor

PIT type generators

PIT type generators are used for smaller, low-head applications and are coupled via step-up gear to the horizontal turbine shaft. For low-head hydropower stations with lower ratings, pit applications are an economical solution, typically up to 17 MVA and with 500 to 900 rpm. PIT generators stand for robust design and cope reliably with the high runaway speeds required for hydropower plants.